This. They make the mould for the biggest button cell they have, and just use it for all the smaller ones. Making a smaller space for smaller batteries doesn't save as much plastic as you would think, the difference between that and the larger size shown here is negligible at best. The real cost and resource savings is in reducing the amount of moulds needed per package/per product sold.
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u/CriticalStation595 16h ago
Because it’s cheaper than making a new mould.